Open a project (.hhp) file, and then click Add/Modify Window Definitions.
Add/Modify Window Definitions
Adds or edits window definitions and the general appearance of the HTML Help Viewer.
Type a name for the Help Viewer in the Create a window type named box.
On the General, Buttons, Position, Files, Navigation Pane, Styles and Extended Styles tabs select the options you want for the Help Viewer.
Note
To change the name of the Help Viewer, open a project (.hhp) file, click Add/Modify Window Definitions, and then type the new name in the Window type box.